.page-about {
  --about-line-soft: rgba(36, 70, 111, 0.62);
  --about-glow: rgba(53, 242, 226, 0.14);
  background: var(--ink);
  color: var(--white);
  font-family: var(--font);
  overflow-x: hidden;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(1.4rem, 4vw, 2.6rem) 0 clamp(2.2rem, 5vw, 3.6rem);
  background:
    radial-gradient(120% 95% at 80% -15%, rgba(53, 242, 226, 0.16), transparent 62%),
    radial-gradient(85% 70% at 8% -5%, rgba(255, 90, 54, 0.11), transparent 58%),
    var(--ink);
  border-bottom: 1px solid var(--line);
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(36, 70, 111, 0.34) 1px, transparent 1px),
    linear-gradient(90deg, rgba(36, 70, 111, 0.34) 1px, transparent 1px);
  background-size: 74px 74px;
  -webkit-mask-image: radial-gradient(120% 82% at 62% 0%, #000 8%, transparent 72%);
  mask-image: radial-gradient(120% 82% at 62% 0%, #000 8%, transparent 72%);
  opacity: 0.55;
  pointer-events: none;
}

.page-about .about-hero .container {
  position: relative;
  z-index: 1;
}

.page-about .breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
  list-style: none;
  margin: 0 0 clamp(1.2rem, 3vw, 2rem);
  padding: 0;
  font-size: 0.8rem;
  letter-spacing: 0.04em;
  color: var(--mist);
}

.page-about .breadcrumb__list li + li::before {
  content: "/";
  margin-right: 0.5rem;
  color: var(--line);
}

.page-about .breadcrumb__list a {
  color: var(--mist);
  text-decoration: none;
  transition: color var(--speed) var(--ease);
}

.page-about .breadcrumb__list a:hover,
.page-about .breadcrumb__list a:focus-visible {
  color: var(--cyan);
}

.page-about .breadcrumb__current {
  color: var(--white);
}

.page-about .about-hero__grid {
  display: grid;
  gap: 1rem;
  grid-template-columns: minmax(0, 1fr);
  grid-template-areas:
    "kicker"
    "title"
    "lede"
    "card";
}

.page-about .about-hero__kicker {
  grid-area: kicker;
  margin: 0;
  font-size: 0.72rem;
  letter-spacing: 0.24em;
  color: var(--cyan);
  text-transform: uppercase;
}

.page-about .about-hero__title {
  grid-area: title;
  margin: 0.2rem 0 0;
  font-size: clamp(2.3rem, 8.2vw, 5.4rem);
  line-height: 1.02;
  font-weight: 900;
  letter-spacing: -0.035em;
  transform: skewX(-1.6deg);
  transform-origin: left bottom;
  text-wrap: balance;
}

.page-about .about-hero__lede {
  grid-area: lede;
  margin: 0.4rem 0 0;
  max-width: 60ch;
  font-size: clamp(0.98rem, 1.6vw, 1.08rem);
  line-height: 1.8;
  color: var(--mist);
}

.page-about .brand-card {
  grid-area: card;
  position: relative;
  align-self: start;
  margin: 0.6rem 0 0;
  padding: 1.5rem 1.1rem 1.1rem;
  border: var(--border);
  background: linear-gradient(158deg, rgba(18, 41, 77, 0.94), rgba(10, 23, 48, 0.94));
  box-shadow: 0 22px 46px -30px rgba(0, 0, 0, 0.95);
}

.page-about .brand-card::before {
  content: "";
  position: absolute;
  left: -1px;
  top: -1px;
  width: 46px;
  height: 2px;
  background: var(--cyan);
}

.page-about .brand-card__stamp {
  position: absolute;
  top: -0.72rem;
  right: 0.9rem;
  display: inline-block;
  padding: 0.18rem 0.55rem;
  background: var(--flame);
  color: #1a0600;
  font-size: 0.76rem;
  font-weight: 700;
  letter-spacing: 0.12em;
}

.page-about .brand-card__row {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 0.2rem 0.8rem;
  margin: 0;
  padding: 0.62rem 0;
  border-bottom: 1px dashed var(--about-line-soft);
}

.page-about .brand-card__row:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

.page-about .brand-card__k {
  font-size: 0.76rem;
  letter-spacing: 0.12em;
  color: var(--mist);
}

.page-about .brand-card__v {
  font-size: 0.88rem;
  font-weight: 700;
  color: var(--cyan-soft);
  text-align: right;
}

.page-about .about-stats {
  list-style: none;
  margin: clamp(1.6rem, 4vw, 2.6rem) 0 0;
  padding: clamp(1rem, 2.4vw, 1.4rem) 0 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1.1rem 1rem;
  border-top: 1px solid var(--line);
}

.page-about .about-stats__item {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
}

.page-about .about-stats__num {
  font-size: clamp(1.6rem, 4vw, 2.4rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  color: var(--cyan);
  line-height: 1;
}

.page-about .about-stats__label {
  font-size: 0.8rem;
  letter-spacing: 0.05em;
  color: var(--mist);
}

/* ---------- 主体框架 ---------- */
.page-about .about-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1.4rem;
  padding-top: clamp(1.6rem, 4vw, 2.8rem);
  padding-bottom: clamp(2rem, 5vw, 3.4rem);
}

.page-about .about-index {
  border-left: 2px solid var(--line);
  padding-left: 0.9rem;
}

.page-about .about-index__title {
  margin: 0 0 0.6rem;
  font-size: 0.7rem;
  letter-spacing: 0.24em;
  color: var(--mist);
}

.page-about .about-index__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem 1rem;
}

.page-about .about-index__link {
  display: inline-flex;
  align-items: baseline;
  gap: 0.42rem;
  padding: 0.28rem 0;
  font-size: 0.88rem;
  color: var(--mist);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--speed) var(--ease), border-color var(--speed) var(--ease);
}

.page-about .about-index__link .mono {
  font-size: 0.74rem;
  color: var(--flame);
}

.page-about .about-index__link:hover,
.page-about .about-index__link:focus-visible {
  color: var(--cyan);
  border-bottom-color: var(--cyan);
  outline: none;
}

.page-about .about-index__link:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
}

.page-about .about-flow {
  min-width: 0;
}

/* ---------- 章节 ---------- */
.page-about .about-chapter {
  padding: clamp(1.7rem, 4vw, 2.8rem) 0;
  border-top: 1px solid var(--line);
  scroll-margin-top: 96px;
}

.page-about .about-flow > .about-chapter:first-child {
  border-top: 0;
  padding-top: 0.4rem;
}

.page-about .about-chapter__head {
  display: grid;
  gap: 0.55rem;
  margin-bottom: clamp(1.1rem, 3vw, 1.9rem);
}

.page-about .about-chapter__num {
  font-size: clamp(1.7rem, 4.6vw, 3.2rem);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.05em;
  color: var(--cyan);
  opacity: 0.92;
}

.page-about .about-chapter__title {
  margin: 0;
  font-size: clamp(1.45rem, 4vw, 2.35rem);
  font-weight: 900;
  letter-spacing: -0.025em;
  line-height: 1.18;
  text-wrap: balance;
}

.page-about .about-chapter__lede {
  margin: 0;
  max-width: 64ch;
  font-size: clamp(0.95rem, 1.5vw, 1.02rem);
  line-height: 1.82;
  color: var(--mist);
}

/* ---------- 时间线 ---------- */
.page-about .timeline {
  list-style: none;
  margin: 0;
  padding: 0 0 0.5rem;
  display: flex;
  gap: 0.9rem;
  overflow-x: auto;
  scroll-snap-type: x proximity;
  -webkit-overflow-scrolling: touch;
}

.page-about .timeline__item {
  flex: 0 0 84%;
  min-width: 216px;
  scroll-snap-align: start;
  position: relative;
  padding-top: 1.35rem;
  border-top: 1px solid var(--line);
}

.page-about .timeline__item::before {
  content: "";
  position: absolute;
  top: -4px;
  left: 0;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 0 3px var(--about-glow);
}

.page-about .timeline__item:last-child::before {
  background: var(--flame);
  box-shadow: 0 0 0 3px rgba(255, 90, 54, 0.18);
}

.page-about .tl-card {
  height: 100%;
  padding: 1.05rem 0.95rem 1rem;
  border: var(--border);
  background: linear-gradient(158deg, var(--panel), var(--cabin));
  transition: transform var(--speed) var(--ease), border-color var(--speed) var(--ease);
}

.page-about .tl-card:hover,
.page-about .tl-card:focus,
.page-about .tl-card:focus-within {
  transform: translateY(-3px);
  border-color: var(--cyan);
  outline: none;
}

.page-about .tl-card:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 2px;
}

.page-about .tl-card__tag {
  display: inline-block;
  margin-bottom: 0.7rem;
  font-size: 0.7rem;
  letter-spacing: 0.14em;
}

.page-about .tl-card__title {
  margin: 0 0 0.45rem;
  font-size: 1rem;
  font-weight: 800;
  line-height: 1.45;
}

.page-about .tl-card__text {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.72;
  color: var(--mist);
}

.page-about .tl-card__more {
  margin: 0;
  font-size: 0.85rem;
  line-height: 1.72;
  color: var(--cyan-soft);
  opacity: 1;
}

/* ---------- 团队分工 ---------- */
.page-about .roles {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0.9rem;
}

.page-about .role-card {
  position: relative;
  padding: 1.1rem 1rem 1.05rem;
  border: var(--border);
  background: var(--cabin);
  transition: transform var(--speed) var(--ease), border-color var(--speed) var(--ease), background var(--speed) var(--ease);
}

.page-about .role-card::after {
  content: "";
  position: absolute;
  right: 0.85rem;
  top: 0.85rem;
  width: 22px;
  height: 22px;
  border-top: 1px solid var(--line);
  border-right: 1px solid var(--line);
}

.page-about .role-card:hover,
.page-about .role-card:focus,
.page-about .role-card:focus-within {
  transform: translateY(-2px);
  border-color: var(--cyan);
  background: var(--panel);
  outline: none;
}

.page-about .role-card:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 2px;
}

.page-about .role-card__count {
  margin: 0;
  font-size: 1.9rem;
  font-weight: 700;
  line-height: 1;
  color: var(--flame);
  letter-spacing: -0.03em;
}

.page-about .role-card__count span {
  font-size: 0.78rem;
  font-family: var(--font);
  letter-spacing: 0;
  margin-left: 0.22rem;
  color: var(--mist);
}

.page-about .role-card__name {
  margin: 0.5rem 0 0.4rem;
  font-size: 1.02rem;
  font-weight: 800;
  letter-spacing: 0.01em;
}

.page-about .role-card__text {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.75;
  color: var(--mist);
}

/* ---------- 资料流程 ---------- */
.page-about .steps {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .steps__item {
  display: grid;
  grid-template-columns: 2.1rem minmax(0, 1fr);
  gap: 0 0.75rem;
  padding: 1rem 0;
  border-bottom: 1px dashed var(--about-line-soft);
}

.page-about .steps__item:last-child {
  border-bottom: 0;
  padding-bottom: 0.4rem;
}

.page-about .steps__num {
  padding-top: 0.16rem;
  font-size: 0.86rem;
  color: var(--flame);
  letter-spacing: 0.04em;
}

.page-about .steps__title {
  margin: 0 0 0.28rem;
  font-size: 1rem;
  font-weight: 800;
}

.page-about .steps__text {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.78;
  color: var(--mist);
}

.page-about .process-note {
  margin-top: 1.5rem;
  padding: 1.1rem 1.1rem 1.15rem;
  border: 1px solid var(--line);
  border-left: 3px solid var(--cyan);
  background: linear-gradient(150deg, rgba(18, 41, 77, 0.9), rgba(10, 23, 48, 0.9));
}

.page-about .process-note__title {
  margin: 0 0 0.7rem;
  font-size: 0.82rem;
  font-weight: 800;
  letter-spacing: 0.14em;
  color: var(--cyan);
}

.page-about .process-note__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.55rem;
}

.page-about .process-note__list li {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.2rem 0.6rem;
  font-size: 0.88rem;
  line-height: 1.7;
  color: var(--mist);
}

.page-about .process-note__list .mono {
  min-width: 4.2rem;
  color: var(--cyan-soft);
  font-size: 0.86rem;
  font-weight: 700;
}

/* ---------- 合作生态 ---------- */
.page-about .eco {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1.2rem;
}

.page-about .eco-partners {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0.8rem;
}

.page-about .eco-partner {
  padding: 0.9rem 0.95rem;
  border: 1px solid var(--line);
  background: rgba(10, 23, 48, 0.72);
  transition: border-color var(--speed) var(--ease), background var(--speed) var(--ease);
}

.page-about .eco-partner:hover {
  border-color: var(--cyan);
  background: rgba(18, 41, 77, 0.9);
}

.page-about .eco-partner__name {
  margin: 0 0 0.3rem;
  font-size: 0.95rem;
  font-weight: 800;
  color: var(--white);
}

.page-about .eco-partner__text {
  margin: 0;
  font-size: 0.87rem;
  line-height: 1.72;
  color: var(--mist);
}

.page-about .eco-side {
  display: flex;
  flex-direction: column;
  gap: 0.9rem;
}

.page-about .standards {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.7rem;
}

.page-about .standards__item {
  padding: 0.85rem 0.95rem;
  border: 1px solid var(--line);
  border-left: 3px solid var(--flame);
  background: var(--cabin);
}

.page-about .standards__code {
  display: inline-block;
  margin-bottom: 0.3rem;
  font-size: 0.78rem;
  letter-spacing: 0.14em;
  color: var(--flame);
}

.page-about .standards__text {
  margin: 0;
  font-size: 0.87rem;
  line-height: 1.72;
  color: var(--mist);
}

.page-about .eco-side__note {
  margin: 0;
  padding-left: 0.85rem;
  border-left: 2px solid var(--line);
  font-size: 0.84rem;
  line-height: 1.75;
  color: var(--mist);
}

/* ---------- 服务场景 ---------- */
.page-about .coverage {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1.2rem;
}

.page-about .coverage__visual {
  min-width: 0;
}

.page-about .coverage__map {
  display: block;
  width: 100%;
  height: auto;
  border: 1px solid var(--line);
  background: var(--cabin);
}

.page-about .coverage__caption {
  margin: 0.6rem 0 0;
  font-size: 0.8rem;
  line-height: 1.7;
  color: var(--mist);
}

.page-about .scenes {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0.8rem;
}

.page-about .scene-card {
  padding: 1rem 1rem 1.05rem;
  border: var(--border);
  background: linear-gradient(160deg, var(--panel), var(--cabin));
  transition: transform var(--speed) var(--ease), border-color var(--speed) var(--ease);
}

.page-about .scene-card:hover {
  transform: translateY(-2px);
  border-color: var(--cyan);
}

.page-about .scene-card__title {
  margin: 0 0 0.35rem;
  font-size: 0.98rem;
  font-weight: 800;
  color: var(--cyan-soft);
}

.page-about .scene-card__text {
  margin: 0;
  font-size: 0.88rem;
  line-height: 1.75;
  color: var(--mist);
}

/* ---------- 配图 ---------- */
.page-about .media {
  margin: clamp(1.2rem, 3vw, 1.8rem) 0 0;
}

.page-about .media__img {
  display: block;
  width: 100%;
  height: auto;
  border: 1px solid var(--line);
  object-fit: cover;
}

.page-about .media__caption {
  margin-top: 0.55rem;
  font-size: 0.78rem;
  letter-spacing: 0.03em;
  color: var(--mist);
}

/* ---------- 行动区 ---------- */
.page-about .about-cta {
  border-top: 1px solid var(--line);
  padding: clamp(2rem, 5vw, 3.4rem) 0;
  background:
    radial-gradient(95% 130% at 88% 0%, rgba(255, 90, 54, 0.16), transparent 62%),
    radial-gradient(70% 110% at 5% 100%, rgba(53, 242, 226, 0.1), transparent 60%),
    var(--cabin);
}

.page-about .about-cta__inner {
  display: grid;
  gap: 1.2rem;
}

.page-about .about-cta__title {
  margin: 0 0 0.5rem;
  font-size: clamp(1.4rem, 3.8vw, 2.1rem);
  font-weight: 900;
  letter-spacing: -0.02em;
}

.page-about .about-cta__text {
  margin: 0;
  max-width: 56ch;
  font-size: 0.94rem;
  line-height: 1.78;
  color: var(--mist);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
}

/* ---------- 断点 ---------- */
@media (min-width: 700px) {
  .page-about .roles {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .eco-partners {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .scenes {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 820px) {
  .page-about .timeline {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    overflow: visible;
    padding-bottom: 0;
  }

  .page-about .timeline__item {
    flex: none;
    min-width: 0;
  }

  .page-about .coverage {
    grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.15fr);
    gap: 1.6rem;
    align-items: start;
  }

  .page-about .eco {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    gap: 1.6rem;
  }

  .page-about .about-cta__inner {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: end;
    gap: 2rem;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.55fr) minmax(252px, 0.62fr);
    grid-template-areas:
      "kicker kicker"
      "title  card"
      "lede   card";
    column-gap: clamp(1.6rem, 4vw, 3rem);
    align-items: start;
  }

  .page-about .brand-card {
    margin-top: 0.5rem;
    align-self: stretch;
  }

  .page-about .about-chapter__head {
    grid-template-columns: 84px minmax(0, 1fr);
    column-gap: clamp(1rem, 2.4vw, 1.8rem);
    align-items: start;
  }

  .page-about .about-chapter__num {
    grid-row: 1 / span 2;
    grid-column: 1;
    padding-top: 0.1rem;
  }

  .page-about .about-chapter__title,
  .page-about .about-chapter__lede {
    grid-column: 2;
  }

  .page-about .tl-card__more {
    max-height: 0;
    opacity: 0;
    margin-top: 0;
    overflow: hidden;
    transition: max-height 0.28s var(--ease), opacity 0.28s var(--ease), margin-top 0.28s var(--ease);
  }

  .page-about .tl-card:hover .tl-card__more,
  .page-about .tl-card:focus .tl-card__more,
  .page-about .tl-card:focus-within .tl-card__more {
    max-height: 240px;
    opacity: 1;
    margin-top: 0.6rem;
  }
}

@media (min-width: 1000px) {
  .page-about .about-body {
    grid-template-columns: 196px minmax(0, 1fr);
    gap: clamp(1.8rem, 4vw, 3.4rem);
  }

  .page-about .about-index {
    position: sticky;
    top: 92px;
    align-self: start;
  }

  .page-about .about-index__list {
    flex-direction: column;
    flex-wrap: nowrap;
    gap: 0.1rem;
  }

  .page-about .about-index__link {
    width: 100%;
  }
}

@media (min-width: 780px) {
  .page-about .about-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 0;
  }

  .page-about .about-stats__item {
    padding: 0 1.2rem;
    border-left: 1px solid var(--about-line-soft);
  }

  .page-about .about-stats__item:first-child {
    padding-left: 0;
    border-left: 0;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .tl-card,
  .page-about .role-card,
  .page-about .scene-card,
  .page-about .eco-partner,
  .page-about .about-index__link {
    transition: none;
  }

  .page-about .tl-card:hover,
  .page-about .role-card:hover,
  .page-about .scene-card:hover {
    transform: none;
  }

  .page-about .about-hero__title {
    transform: none;
  }
}
<<<END>>>